Apparatus for molding concrete walls in situ.



G. CLARK. APPARATUS FOR MOLDING CONCRETE WALLS IN SITU.

APPLIOATION FILED SEPT. 18, 1912.

' Patented June 23, 1914.

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COLUMBIA PMNOURAPH co.. WASHINGTON, n. c.

UNITED STATES PATENT OFFICE.

GEORGE CLARK, 0F BONIDI BEACH, SYDNEY, NEW SOUTH WALES, AUSTRALIA.

APPARATUS FOR MOLDING CONCRETE WALLS IN SITU.

Specification of Letters Patent.

Patented June 23, 1914.

Original application filed October 15, 19-12, Serial No. 578,254. Divided and this application filed September 18, 1912. Serial No. 721,095.

To all whom it may concern Be it known that I, GEORGE CLARK, a subject of the King of Great Britain, residing at Bondi Beach, Sydney, in the State of New South Wales, Australia, architect, have invented Apparatus for Molding Concrete Walls i/n, Sim.

The present application is a division of my copending application Serial No. 578,- 254, filed Oct. 15, 1912.

The following is a specification of my invention:

The object of this invention is to provide simple apparatus for use in molding concrete walls in sizfu continuously and expeditiously.

The invention is illustrated by the accompanying drawings, whereof- Figure 1 is a perspective view of a section of concrete building showing the apparatus in position for constructing both cavity and solid walls, Fig. 2 is a detail perspective illustrating the external angle construction, Fig. 3 is a transverse section through the foundation showing the means of erecting the apparatus thereon for the first course of concrete, Fig. 4 is a plan of the apparatus showing the application of the cores thereto.

The apparatus comprises mold planks C, C, adapted to be set on edge face to face at the required distance apart. These planks are provided near their lower edges and on their inner or adjacent sides with laterally projecting pins G which after the first course is molded rest on the preceding course of concrete, such as B or B and while temporarily supporting the planks constitute the gage for the height of each course. By this means the lower portion C of the planks below the pins 0 overlap the previously molded course of concrete on the outside.

The planks are clamped to form the mold by clamping devices D comprising vertical ribs a arranged opposite each other and placed against the outside of the respective planks. Each rib of the pair extends above the top edges of the planks and is connected to the other by a compression rod I) adjusted by means of nuts engaging the threaded ends of said rod which pass through holes in the ribs a. By adjusting the length of the compression rod between the ribs, the grip of the clamping device may be regulated.

are clamped against the top of the course of concrete below such as B and B .Hopper boards E, provided with notches E which fit over the draw bars, are placed on the top of the planks and the concrete is filled in and tamped to the level of the planks, after which the hopper boards are removed and the concrete struck or leveled with the top of the planks.

Owing to foundations being usually wider than the courses, the first course is molded by erecting the planks on the foundations and placing temporary spreaders S on the latter between the lower edges of the planks, as in Fig. 3. The planks are clamped by the means described and the spreaders are removed as soon as su'liicient concrete is filled in to maintain the planks in position.

In order to hold the planks firmly when forming an external angle, two clamping ribs a are fixed to an inner angle piece a as in Fig. 2, and a comparatively short compression rod and a draw bar with a cam lever are attached thereto.

In building hollow or cavity walls, a series of clamping devices are grouped together by means of adjustable distance rods 9, which connect the ribs a and collapsible cores F are temporarily secured between the planks preferably by being suspended from the draw bars. To this end the latter are provided on one side with a socket e and on the other side with two clips or lugs f.

The core has a lug r on one end which fits into the socket e on the draw bar of the clamping device, while on the other end are corner lugs s which rest on the clips or lugs f of the adjacent draw bar. 1

In using this apparatus after a certain section of one course of concrete is completed, the cores, if cavity walls are being constructed, are collapsed and removed after which the clamping devices and mold planks are displaced and erected ahead for another length of work and the cores replaced on the draw bars and expanded again when the doors and windows, the frames thereof are fixed in position as the work proceeds and temporary relief linings are fixed between the frames and planks where necessary to block the concrete and form the mold required.

I claim In an apparatus for molding concrete Walls in situ, in combination, mold planks set on edge and adapted to overlap the sides of the previous course of concrete; clamping devices for maintaining the relation of the mold planks and comprisingribs fitted directly against the outer faces of the planks and disposed in pairs, a transverse compression rod connecting the upper ends of the ribs of each pair, a transversedraw bar connecting the ribs of each pair at points just above the upper edges of the mold planks, the draw'b'ar being fixedly associated with one of the ribs and having its ends projecting through an opening in the other rib and provided with a cam latch, longitudinally disposed distance rods connecting each rib ofa pair with-therib of an adjacent pairat the same side of the course, the draw bars being constructed to coact in pairs in centering and supporting a core, and cores adapted to vbe centered between and supported selected ,pairs of draw bars and being removable fromsaid draw bars.

In testimony whereof I havehereunto set myhand in presence of twoisub scribing witnesses.

G QB E C A l -i r e s CHARLES G. GRAHAM,

YV. C A K copies, otthis patent may he obtained tor five centsi each-by addressing tl eflflcn mi ie c; o P e t Washingtpn, 13.03 

